change in backup behavior from 2.5 to 2.6

[Larry Bernstone]

In rsync 2.5, using the --backup and --backup-dir switches without a
--suffix would copy backed up files to the backup dir with no extension.
 In 2.6, you must use a blank suffix ("suffix=") in order to get the
same behavior.  This means that 2.5 clients are unable to backup to the
server without putting a suffix on the backups.  The documentation also
still indicates that the old behavior would be expected.  Can someone
clarify which is the current correct behavior, and if the new
methodology is correct, can the documentation be changed?